no more than 3 m. from the surface
skimmers and preferably at a level of
0.5 m. (never more than 3 m.) below the
level of the water, in order to achieve its
“under load” functioning. The selection
valve junction, and its connection to the
nozzle and other accessories incorporated
in the swimming pool will preferably be
made in PVC casing.
Pipe diameters will depend on flows. The
maximum water speed advisable in the
pipes will be 1,2 m/s. in aspiration and 2
m/s. on return. In any event, the diamenter
of the aspiration pipe must not be less
than the diameter of the pump nozzle.
The aspiration pipe must be perfectly
water-tight and must be installed with a
downward inclination, thus avoiding the
formation of air pockets.
In permanent installations, with the pump
positioned at a higher level than that of
the water, it is advisable for the longest
stretch of the aspiration pipe to be below
the plans mentioned until it reaches the
vertical pipe wich coincides with the pump
aspiration shaft. The aspiration pipe can
be either rigid or flexible with a reinforced
coil to avoid contraction.
In fixed installations, with the pump
below the water level, a shut-off valve
will be placed on the aspiration pipe
and another on the header pipe.
When using as a portable pump, suitable
electrical protection must be provided and the
pump must be assembled on an insulated base.
5.3. CONNECTION TO THE MAINS.
- In general terms, the electrical
installation will fully comply with the
Regulations and Complementary
Technical provisions applicable and will
be performed by an authorised Installer.
- The supply will have neutral and earth wires.
- The mains voltage must correspond to
that shown on the nameplate rating for
the equipment.
- The earth wire to be used must be sufficient
to take, without deterioration, the current
absorbed by the equipment (see nameplate).
- The mains earth wire will be connected
electrically to all metal parts of the equipment
which should not be under current, but
which could accidentally be affected by
the same and which are accessible to
persons (see figs. 2 - 5, pages. 37 - 39).
It is obligatory to install a protection and
operation switchboard which will
contain all necessary and recommended
elements. In general terms, it will
contain:
a) General cut-off or unipolar switch.
b) Short-circuit and overload protection
devices for motors.
c) 30 m.A. differential high sensitivity
switch.
d) Others for monitoring and control.
The electrical characteristics of the
protection devices and their regulation
will comply with those for the motors to
be prortected and with the service
conditions envisaged for these, and the
instructions given by the manufacturer
must be followed (see nameplate).
- In the case of equipment with triphase
motors, the motor winding interconnection
bridges must be suitably positioned
(see figs. 4 - 5, page 39).
- Conductor inlets and outlets at the
bushing box will have stuffings to
ensure the absence of damp and dirt,
and will therefore have a sealed casing.
- Conductors will have suitable terminals
for connection to the bushings.
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